<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    const num = 10
    console.log(typeof num + '11');
    console.log(typeof (num + '11'));
    console.log(typeof (num + + '11'));

  </script>
</body>

</html>